Anaphylactic reaction due to unspecified food, init encntr

This diagnosis code signifies a severe, life-threatening allergic reaction (anaphylaxis) that occurs after exposure to an unknown food allergen. It involves a rapid onset of symptoms affecting multiple body systems, such as respiratory distress, cardiovascular collapse, gastrointestinal upset, and skin manifestations.

This code is appropriate for documenting an initial presentation of anaphylaxis where the specific food trigger has not yet been identified or confirmed. It is used when a patient presents to an emergency department, urgent care, or physician's office with acute symptoms consistent with anaphylaxis following food ingestion, but the causative food is still under investigation.

• Ensure documentation clearly states "anaphylactic reaction" and "unspecified food" as the trigger.
• This code is for the initial encounter for this specific condition; subsequent encounters for the same episode would use a different seventh character.
• Do not use this code if a specific food allergen (e.g., peanuts, shellfish) is known or suspected and documented.